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Download Genetic Material The Hershey-Chase experiment was designed to
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Bio07_TR__U04_CH12.QXD 5/3/06 3:44 PM Page 55 Name______________________________ Class __________________ Date ______________ Genetic Material The Hershey-Chase experiment was designed to find out whether DNA or protein carried a virus’s genetic information. The scientists used radioactive substances to label the DNA in some viruses and the protein coat in other viruses. Then they let the viruses inject their genetic material into bacteria. Label the DNA with radioactive label, and the DNA without radioactive label. DNA with radioactive label Protein coat with radioactive label Phage infects bacteria Phage infects bacteria Use the diagram to answer the question. Circle the best answer. 1. What did Hershey and Chase conclude was the genetic material of the virus? DNA protein © Pearson Education, Inc., publishing as Pearson Prentice Hall. 55 Bio07_TR__U04_CH12.QXD 5/3/06 3:44 PM Page 56 Name______________________________ Class __________________ Date ______________ Base Pairing Four nucleotides make up DNA: adenine, cytosine, guanine, and thymine. These nucleotides always occur in pairs called base pairs. Write the missing letter to complete each base pair. The first two have been done for you. C G A T G G C C Key A = Adenine C = Cytosine G = Guanine T = Thymine T A C Use the diagram to answer the questions. 1. What nucleotide is always paired with thymine? 2. What nucleotide is always paired with guanine? © Pearson Education, Inc., publishing as Pearson Prentice Hall. 56